Touch Screen Gesture Key Input Control for Stylus
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Solution Overview
Problem
Portable terminals with touch screens face difficulties in activating hardware keys using stylus pens or other input objects, as it is challenging to intuitively perform input operations without physically pressing or moving the input medium into the key activation area.
Innovation Solution
A method and apparatus that utilize a gesture recognizing unit to detect predetermined gestures on the screen, identify the corresponding area, and recognize assigned hardware keys, allowing key input operations without direct activation or movement into the key area, using a gesture recognizing unit, a gesture area identifying unit, and a key input recognizing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hardware keys are provided on the portable terminal, then key input functionality is available, but it becomes difficult to activate or press the hardware keys using a stylus pen or other input objects
Solution Approach 1:
The touch screen is designed to serve multiple functions: it acts as both a display interface and a virtual keyboard surface. By making the touch screen responsive to stylus inputs in the same way physical keys respond to pressing, the system achieves multi-functionality where one component (touch screen) replaces multiple components (physical keys + stylus interface), thereby improving ease of operation without adding device complexity
Solution Approach 2:
The patent replaces the mechanical key pressing system with a tactile feedback-based electronic system. Instead of requiring physical contact with mechanical keys, the stylus generates touch events on the touch screen that are detected and processed electronically, with tactile feedback providing the sensation of key pressing. This substitution eliminates the limitation of physical key activation while maintaining the intended input experience
2Area of stationary object
If the touch screen area is increased, then more applications can be displayed, but the area for hardware keys is reduced or eliminated
Solution Approach 1:
The touch screen assumes dual functionality as both display area and key input area. Virtual keys are displayed on the touch screen surface, allowing the entire screen to serve as the keyboard interface. This eliminates the need for separate physical key areas, maximizing display space while maintaining full key input functionality through touch or stylus interaction
Solution Approach 2:
The patent transitions from a two-dimensional physical key layout to a multi-layered interaction model where virtual keys exist on the display plane but respond to stylus inputs that can originate from any area of the screen. The gesture recognition system adds another dimension by recognizing patterns and sequences of touches, allowing key activation without direct contact with the key area itself
3Reliability
If separate hardware keys are included, then dedicated key functions are available, but the input process becomes less intuitive without physical pressing
Solution Approach 1:
The system implements tactile feedback that provides sensory confirmation when a virtual key is activated by stylus input. This feedback mechanism creates a closed-loop system where the user's action (stylus touch) produces an immediate sensory response (tactile feedback), enhancing input intuitiveness by mimicking the physical pressing sensation while maintaining reliable key recognition through electronic detection of touch events and gestures
Data Source
AI summary
A key input control apparatus includes a gesture recognizing unit which detects whether or not an input of a touch event generated on a screen corresponds to a predetermined gesture. A gesture area identifying unit which identifies a predetermined area where the input of the touch event corresponding to the predetermined gesture is generated. A key input recognizing unit which recognizes a hardware key allotted to the predetermined area and performs an operation corresponding to an input of the recognized hardware key.